Fixes a couple problems with GC of unoptimized code.

runtime/vm/deopt_instructions.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_DEOPT_INSTRUCTIONS_H_
 #define VM_DEOPT_INSTRUCTIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
@@ skipping 264 matching lines @@
 // the heap and reset the builder's internal state for the next DeoptInfo.
 class DeoptInfoBuilder : public ValueObject {
  public:
   explicit DeoptInfoBuilder(const intptr_t num_args);
 
   // 'object_table' holds all objects referred to by DeoptInstr in
   // all DeoptInfo instances for a single Code object.
   const GrowableObjectArray& object_table() { return object_table_; }
 
   // Return address before instruction.
-  void AddReturnAddress(const Function& function,
+  void AddReturnAddress(const Code& code,
                         intptr_t deopt_id,
                         intptr_t dest_index);
 
   // Copy from optimized frame to unoptimized.
   void AddCopy(Value* value, const Location& source_loc, intptr_t dest_index);
-  void AddPcMarker(const Function& function, intptr_t dest_index);
-  void AddPp(const Function& function, intptr_t dest_index);
+  void AddPcMarker(const Code& code, intptr_t dest_index);
+  void AddPp(const Code& code, intptr_t dest_index);
   void AddCallerFp(intptr_t dest_index);
   void AddCallerPp(intptr_t dest_index);
   void AddCallerPc(intptr_t dest_index);
 
   // Add object to be materialized. Emit kMaterializeObject instruction.
   void AddMaterialization(MaterializeObjectInstr* mat);
 
   // For every materialized object emit instructions describing data required
   // for materialization: class of the instance to allocate and field-value
   // pairs for initialization.
@@ skipping 69 matching lines @@
                        DeoptInfo* info,
                        Smi* reason);
 
  private:
   static const intptr_t kEntrySize = 3;
 };
 
 }  // namespace dart
 
 #endif  // VM_DEOPT_INSTRUCTIONS_H_